September weather forecast
Katwijk aan den Rijn, Netherlands

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September

Weather in September

The first month of the autumn, September, is also an enjoyable month in Katwijk aan den Rijn, Netherlands, with an average temperature fluctuating between 18.1°C (64.6°F) and 13.8°C (56.8°F).

Temperature

As Katwijk aan den Rijn steps into September, the average high-temperature is measured at a refreshing 18.1°C (64.6°F), displaying minor differences from August's 21°C (69.8°F). The nights of September in Katwijk aan den Rijn anticipate a slight dip from daytime high temperatures, settling to an average low-temperature of 13.8°C (56.8°F).

Humidity

In September, the average relative humidity is 77%.

Rainfall

In Katwijk aan den Rijn, during September, the rain falls for 15.6 days and regularly aggregates up to 40mm (1.57") of precipitation. Throughout the year, there are 183.4 rainfall days, and 400mm (15.75") of precipitation is accumulated.

Snowfall

In Katwijk aan den Rijn, Netherlands, snow does not fall in April through October.

Daylight

In Katwijk aan den Rijn, the average length of the day in September is 12h and 39min.
On the first day of September, sunrise is at 06:54 and sunset at 20:29. On the last day of the month, sunrise is at 07:42 and sunset at 19:21 CEST.

Sunshine

The average sunshine in September is 7.1h.

UV index

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.
Note: The UV index of 4 during September leads to these advisories:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Updated: Jan 25, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in Katwijk aan den Rijn in September?
In Katwijk aan den Rijn, 18.1°C (64.6°F) is the average high-temperature and 13.8°C (56.8°F) is the average low-temperature during September.
What is the average humidity in September in Katwijk aan den Rijn?
In September, the average relative humidity in Katwijk aan den Rijn, Netherlands, is 77%.
How much does it rain in Katwijk aan den Rijn in September?
In Katwijk aan den Rijn, in September, it is raining for 15.6 days, with typically 40mm (1.57") of accumulated precipitation.
When it does not snow in Katwijk aan den Rijn?
April through October are months without snowfall.
How many hours of daylight does Katwijk aan den Rijn have in September?
In Katwijk aan den Rijn, Netherlands, the average day length in September is 12h and 39min.
When is the sunrise / sunset in September in Katwijk aan den Rijn?
In September, on the first day of the month, sunrise is at 06:54 and sunset at 20:29. On the last day of the month, sunrise is at 07:42 and sunset at 19:21 CEST.
How long on average sun shines in September in Katwijk aan den Rijn?
The average sunshine duration in September is 7.1h.
How high is the UV index in September in Katwijk aan den Rijn?
In September, the average daily maximum UV index in Katwijk aan den Rijn, Netherlands, is 4. A UV Index reading of 3 to 5 represents a moderate health threat from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJFMAMJJASeptemberOND
Aug
September
Oct
Average high temperature
21°C
18.1°C
14.6°C
Average low temperature
16.3°C
13.8°C
10.7°C
Average pressure
1015mbar
1016.8mbar
1015.5mbar
Average wind speed
16.5km/h
17.5km/h
20.2km/h
Average max. wind speed
17.6km/h
18.1km/h
21.3km/h
Average wind speed gusts
24.4km/h
26.3km/h
30.5km/h
Average humidity
75%
77%
79%
Average rainfall
53mm
40mm
39mm
Average rainfall days
19.1
15.6
17.3
Average snowfall
0mm
0mm
0mm
Average snowfall days
0
0
0
Average daylight
14h 4min
12h 4min
10h 4min
Average sunshine
9h 3min
7h 1min
5h 0min
Average sunshine days
9.5
10.8
9.6
Average UV index
5
4
4
Average cloud cover
38%
44%
53%
Average visibility
10km
10km
10km
Average temperature in September
Katwijk aan den Rijn, Netherlands
  • Average high temperature in September: 18.1°C

The warmest month (with the highest average high temperature) is August (21°C).
The month with the lowest average high temperature is January (5.8°C).

  • Average low temperature in September: 13.8°C

The month with the highest average low temperature is August (16.3°C).
The coldest month (with the lowest average low temperature) is February (2.8°C).

Average pressure in September
Katwijk aan den Rijn, Netherlands
  • Average pressure in September: 1016.8mbar

The month with the highest atmospheric pressure is September (1016.8mbar).
The month with the lowest atmospheric pressure is November (1011.2mbar).

Average wind speed in September
Katwijk aan den Rijn, Netherlands
  • Average wind speed in September: 17.5km/h

The windiest month (with the highest average wind speed) is December (24.7km/h).
The calmest month (with the lowest average wind speed) is July (16.1km/h).

Average humidity in September
Katwijk aan den Rijn, Netherlands
  • Average humidity in September: 77%

The months with the highest relative humidity are January and December (83%).
The months with the lowest relative humidity are April and August (75%).

Average rainfall in September
Katwijk aan den Rijn, Netherlands
  • Average rainfall in September: 40mm

The wettest month (with the highest rainfall) is August (53mm).
The driest month (with the least rainfall) is April (14mm).

Average rainfall days in September
Katwijk aan den Rijn, Netherlands
  • Average rainfall days in September: 15.6 days

The month with the highest number of rainy days is August (19.1 days).
The month with the least rainy days is April (11.3 days).

Average snowfall in September
Katwijk aan den Rijn, Netherlands
  • Average snowfall in September: 0mm

The month with the highest snowfall is February (22mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).

Average snowfall days in September
Katwijk aan den Rijn, Netherlands
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (3.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Katwijk aan den Rijn, Netherlands
  • Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 16h and 42min).
The month with the shortest days is December (Average daylight: 7h and 48min).

  • Average sunshine in September: 7h and 1min

The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 3h and 30min).

Average sunshine days in September
Katwijk aan den Rijn, Netherlands
  • Average sunshine days in September: 10.8 days

The month with the most sunshine days is April (16.8 days).
The month with the least sunshine days is December (8.1 days).

Average UV index in September
Katwijk aan den Rijn, Netherlands
  • Average UV index in September: 4

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in September
Katwijk aan den Rijn, Netherlands
  • Average cloud cover in September: 44

The month with the most cloud cover is December (Cloud cover 65).
The months with the least cloud cover are April and August (Cloud cover 38).

Average visibility in September
Katwijk aan den Rijn, Netherlands
  • Average visibility in September: 10km

The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (10km).
The months with the lowest visibility are January and December (9km).

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